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US 9,039,942 B2Granted
Lead-free conductive paste composition and semiconductor devices made therewith
AssigneeE. I. Du Pont de Nemours and Company
InventorsCarmine Torardi, Paul Douglas Vernooy
Life of this patent
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Abstract
A lead-free conductive paste composition contains a source of an electrically conductive metal, a fusible material, an optional additive, and an organic vehicle. An article such as a high-efficiency photovoltaic cell is formed by a process of deposition of the lead-free paste composition on a semiconductor substrate (e.g., by screen printing) and firing the paste to remove the organic vehicle and sinter the metal and fusible material.
Claims14
A paste composition comprising in admixture:
- (a) a source of electrically conductive metal;
- (b) a fusible material comprising:
- 50-90 wt. % Bi2O3,
- 8-15 wt. % Al2O3,
- 2-26 wt. % SiO2,
- 0-9 wt. % B2O3, and
- wherein the weight percentages are based on the total fusible material, and wherein some or all of at least one of the oxides is optionally replaced by a fluoride of the same cation in an amount such that the fusible material comprises at most 5 wt. % of fluorine, based on the total fusible material;
- and
- (c) an organic vehicle, and
- wherein the paste composition is lead-free.
7 more elements
A paste composition comprising in admixture:
- (a) a source of electrically conductive metal;
- (b) a fusible material comprising:
- 50-90 wt. % Bi2O3,
- 6.5-15 wt. % Al2O3,
- 2-8 wt. % SiO2,
- 0.5-9 wt. % B2O3, and
- wherein the weight percentages are based on the total fusible material, and wherein some or all of at least one of the oxides is optionally replaced by a fluoride of the same cation in an amount such that the fusible material comprises at most 5 wt. % of fluorine, based on the total fusible material;
- and
- (c) an organic vehicle, and
- wherein the paste composition is lead-free.
7 more elements
Dependencies are inferred from the claim text.